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In polluted environments, dolphins gradually accumulated toxins in their body fat, and the larger the dolphin, the more accumulated toxin it can tolerate. Nearly 80 percent of the toxins a female dolphin has accumulated pass into the fat-rich milk her nursing calf ingests. Therefore, the unusually high mortality rate among dolphin calves in the industrially contaminated waters along Florida’s Gulf Coast is probably the result of their being poisoned by their mother’s milk.

Which of the following, if true, most strengthens the argument?

A

The survival rate of firstborn dolphin calves in the area along Florida’s Gulf Coast is highest for those whose mothers were killed before they were weaned.

分析A选项

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B

The rate at which adult dolphins living in the waters along Florida’s Gulf Coast accumulate toxins is no higher than that of adult dolphins in comparably polluted waters elsewhere.

分析B选项

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C

Among dolphin calves born in the area along Florida’s Gulf Coast, the mortality rate is highest among those with living siblings.

分析C选项

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D

As dolphins age, they accumulate toxins from the environment more slowly than when they were young.

分析D选项

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E

Dolphins, like other marine mammals, have a higher proportion of body fat than do most land mammals.

分析E选项

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正确答案：A 耗时：秒

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当前版本由
百香果蜂蜜茶 更新于2015-12-24 15:08:53 感谢由
百香果蜂蜜茶 对此题目的解答所做出的贡献。

原文结论是，Dolphin高的死亡率是因为poisoned by their mother's milk。

求加强。

A 还没断奶妈妈就被杀的first born calves 的存活率高，也就是说很早就断奶，这样喝妈妈奶水少，当然中毒就浅或没有中毒，所以加强原文，高死亡率是因为奶水。